package juc;

import java.util.concurrent.TimeUnit;

/**
 * @author lzy
 * Create DateTime: 2018/7/17 10:48
 * @version v1.0
 * <p>
 * 生产者和消费者案例
 * 如果不采用等待唤醒机制，会产生如下问题：
 * 如果生产者速度过快，会产生数据丢失的问题
 * 如果消费者速度过快，会产生重复数据和错误数据的问题
 */
public class TestProductAndConsumer {
    public static void main(String[] args) {
        Clerk clerk = new Clerk();

        Productor productor = new Productor(clerk);
        Consumer consumer = new Consumer(clerk);

        new Thread(productor, "生产者A").start();
        new Thread(consumer, "消费者B").start();

        new Thread(productor, "生产者C").start();
        new Thread(consumer, "消费者D").start();

        new Thread(productor, "生产者E").start();
        new Thread(consumer, "消费者F").start();
    }
}

// 店员
class Clerk {
    private int product = 0;

    //进货
    public synchronized void get() {
        while (product >= 1) {
            System.out.println("产品已满！");
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println(Thread.currentThread().getName() + ":" + ++product);
        this.notifyAll();

    }

    //卖货
    public synchronized void sale() {
        while (product <= 0) {
            System.out.println("缺货！");
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println(Thread.currentThread().getName() + ":" + --product);
        this.notifyAll();

    }
}

// 生产者
class Productor implements Runnable {
    private Clerk clerk;

    public Productor(Clerk clerk) {
        this.clerk = clerk;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            try {
                TimeUnit.MILLISECONDS.sleep(200);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            clerk.get();
        }
    }
}

// 消费者
class Consumer implements Runnable {

    private Clerk clerk;

    public Consumer(Clerk clerk) {
        this.clerk = clerk;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            clerk.sale();
        }
    }
}
